scsi: core: Move REPORT TARGET PORT GROUPS into the SCSI core

ALUA is a standard SCSI feature, independent of multipathing, but only
the ALUA device handler can currently send REPORT TARGET PORT GROUPS.
Move submit_rtpg() into the SCSI core as scsi_report_tpgs(), together
with the resubmission with a larger buffer that alua_rtpg() did when the
parameter data did not fit, so that the core can read the ALUA state of
a device itself. The parameter data format definitions move to
scsi_proto.h with it.

scsi_dh_alua calls scsi_report_tpgs() with the same timeout, retries
and parameter data format as before.

No functional change.

Suggested-by: Hannes Reinecke <hare@kernel.org>
Co-developed-by: Krishna Kant <krishna.kant@purestorage.com>
Signed-off-by: Krishna Kant <krishna.kant@purestorage.com>
Signed-off-by: Brian Bunker <brian@purestorage.com>
Reviewed-by: Hannes Reinecke <hare@kernel.org>
Link: https://patch.msgid.link/20261029002531.82824-2-brian@purestorage.com
Signed-off-by: Martin K. Petersen (Oracle) <mkp@kernel.org>

0 files changed, 0 insertions, 0 deletions